feat: add terraform resources

[mcwarman]

Two new resources

• terraform/lock - for update lock files
• terraform/provider - for updating required_providers versions in terraform code

Test

To test this pull request, you can run the following commands:

cd pkg/plugins/resources/terraform
go test ./...

go build -o bin/updatecli && ./bin/updatecli diff --config e2e/updatecli.d/success.d/terraform

Additional Information

Tradeoff

There some logging from the downstream repo, i'm not sure if we can supprress:

update-file-from-source
-----------------------

**Dry Run enabled**

2023/09/01 11:48:48 [DEBUG] providerIndex.createProviderVersion: hashicorp/kubernetes, 2.23.0, linux_amd64
2023/09/01 11:48:48 [DEBUG] Client.ProviderPackageMetadata: GET https://registry.terraform.io/v1/providers/hashicorp/kubernetes/2.23.0/download/linux/amd64
2023/09/01 11:48:48 [DEBUG] ProviderDownloaderClient.download: GET https://releases.hashicorp.com/terraform-provider-kubernetes/2.23.0/terraform-provider-kubernetes_2.23.0_linux_amd64.zip
2023/09/01 11:48:48 [DEBUG] ProviderDownloaderClient.download: GET https://releases.hashicorp.com/terraform-provider-kubernetes/2.23.0/terraform-provider-kubernetes_2.23.0_SHA256SUMS
⚠ - "hashicorp/kubernetes" updated from "2.22.0" to "2.23.0" in file ".terraform.lock.hcl"

Potential improvement

• There's a lot of duplications between hcl, terraform/lock and terraform/provider in how source, conditions and target works, probably the same with others as well.
• Terraform registry source
• Terraform auto discovery

[olblak]

The Terraform autodiscovery and Terraform registry as a source would indeed be a great addition.
Regarding the code refactoring, I guess this will come naturally :)

I just did some testing with the e2e tests and it works great :)

[olblak]

It would great to have the documentation on https://github.com/updatecli/website/ for those two plugins :)